<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>sessionStorage</title>
</head>
<body>
    <input type="text">
    <button class="set">存储数据</button>
    <button class="get">获取数据</button>
    <button class="remove">删除数据</button>
    <button class="del">清空数据</button>
    <script>
        var ipt = document.querySelector('input')
        var set = document.querySelector('.set')
        var get = document.querySelector('.get')
        var remove = document.querySelector('.remove')
        var del = document.querySelector('.del')
        set.addEventListener('click',function(){
            // 存储数据
            var val = ipt.value;
            sessionStorage.setItem('uname',val)
            sessionStorage.setItem('pwd',val)
        });
        get.addEventListener('click',function(){
            // 获取数据
            console.log(sessionStorage.getItem('uname'));
        });
        remove.addEventListener('click',function(){
            // 删除数据
            sessionStorage.removeItem('uname')
        });
        del.addEventListener('click',function(){
            // 清空数据
            sessionStorage.clear()
        })
    </script>
</body>
</html>